Buoy



FIG. 1 is a front elevational view of a buoy showing my new design, with the rear being a mirror image;

FIG. 2 is a side elevational view thereof, with the opposite side being a mirror image;

FIG. 3 is a bottom plan view;

FIG. 4 is a top plan view; and,

FIG. 5 is an enlarged perspective view as seen from the front, top and left side. 

The ornamental design for a buoy, as shown and described. 